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From edbd19bb260f7a98bc9e0b49fe2f0b8214885797 Mon Sep 17 00:00:00 2001
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From: Lianbo Jiang <lijiang@redhat.com>
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Date: Tue, 4 Oct 2022 18:57:11 +0800
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Subject: [PATCH 26/28] ppc64: still allow to move on if the emergency stacks
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info fails to initialize
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Currently crash will fail and then exit, if the initialization of
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the emergency stacks information fails. In real customer environments,
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sometimes, a vmcore may be partially damaged, although such vmcores
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are rare. For example:
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# ./crash ../3.10.0-1127.18.2.el7.ppc64le/vmcore ../3.10.0-1127.18.2.el7.ppc64le/vmlinux -s
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crash: invalid kernel virtual address: 38 type: "paca->emergency_sp"
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#
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Lets try to keep loading vmcore if such issues happen, so call
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the readmem() with the RETURN_ON_ERROR instead of FAULT_ON_ERROR,
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which allows the crash move on.
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Reported-by: Dave Wysochanski <dwysocha@redhat.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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ppc64.c | 18 +++++++++---------
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1 file changed, 9 insertions(+), 9 deletions(-)
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diff --git a/ppc64.c b/ppc64.c
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index 4ea1f7c0c6f8..b95a621d8fe4 100644
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--- a/ppc64.c
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+++ b/ppc64.c
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@@ -1224,13 +1224,13 @@ ppc64_init_paca_info(void)
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ulong paca_loc;
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readmem(symbol_value("paca_ptrs"), KVADDR, &paca_loc, sizeof(void *),
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- "paca double pointer", FAULT_ON_ERROR);
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+ "paca double pointer", RETURN_ON_ERROR);
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readmem(paca_loc, KVADDR, paca_ptr, sizeof(void *) * kt->cpus,
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- "paca pointers", FAULT_ON_ERROR);
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+ "paca pointers", RETURN_ON_ERROR);
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} else if (symbol_exists("paca") &&
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(get_symbol_type("paca", NULL, NULL) == TYPE_CODE_PTR)) {
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readmem(symbol_value("paca"), KVADDR, paca_ptr, sizeof(void *) * kt->cpus,
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- "paca pointers", FAULT_ON_ERROR);
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+ "paca pointers", RETURN_ON_ERROR);
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} else {
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free(paca_ptr);
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return;
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@@ -1245,7 +1245,7 @@ ppc64_init_paca_info(void)
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for (i = 0; i < kt->cpus; i++)
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readmem(paca_ptr[i] + offset, KVADDR, &ms->emergency_sp[i],
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sizeof(void *), "paca->emergency_sp",
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- FAULT_ON_ERROR);
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+ RETURN_ON_ERROR);
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}
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if (MEMBER_EXISTS("paca_struct", "nmi_emergency_sp")) {
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@@ -1256,7 +1256,7 @@ ppc64_init_paca_info(void)
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for (i = 0; i < kt->cpus; i++)
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readmem(paca_ptr[i] + offset, KVADDR, &ms->nmi_emergency_sp[i],
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sizeof(void *), "paca->nmi_emergency_sp",
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- FAULT_ON_ERROR);
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+ RETURN_ON_ERROR);
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}
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if (MEMBER_EXISTS("paca_struct", "mc_emergency_sp")) {
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@@ -1267,7 +1267,7 @@ ppc64_init_paca_info(void)
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for (i = 0; i < kt->cpus; i++)
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readmem(paca_ptr[i] + offset, KVADDR, &ms->mc_emergency_sp[i],
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sizeof(void *), "paca->mc_emergency_sp",
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- FAULT_ON_ERROR);
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+ RETURN_ON_ERROR);
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}
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free(paca_ptr);
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@@ -1947,7 +1947,7 @@ ppc64_in_emergency_stack(int cpu, ulong addr, bool verbose)
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if (cpu < 0 || cpu >= kt->cpus)
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return NONE_STACK;
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- if (ms->emergency_sp) {
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+ if (ms->emergency_sp && IS_KVADDR(ms->emergency_sp[cpu])) {
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top = ms->emergency_sp[cpu];
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base = top - STACKSIZE();
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if (addr >= base && addr < top) {
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@@ -1957,7 +1957,7 @@ ppc64_in_emergency_stack(int cpu, ulong addr, bool verbose)
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}
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}
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- if (ms->nmi_emergency_sp) {
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+ if (ms->nmi_emergency_sp && IS_KVADDR(ms->nmi_emergency_sp[cpu])) {
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top = ms->nmi_emergency_sp[cpu];
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base = top - STACKSIZE();
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if (addr >= base && addr < top) {
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@@ -1967,7 +1967,7 @@ ppc64_in_emergency_stack(int cpu, ulong addr, bool verbose)
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}
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}
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- if (ms->mc_emergency_sp) {
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+ if (ms->mc_emergency_sp && IS_KVADDR(ms->mc_emergency_sp[cpu])) {
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top = ms->mc_emergency_sp[cpu];
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base = top - STACKSIZE();
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if (addr >= base && addr < top) {
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--
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2.37.1
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